Based on the following definitions, I make the case that free market anarchism is the only moral system for humans to live under.
Anarchy: A social system based on the recognition that no person or group of persons has the right to rule or initiate violence or aggression against any person or group of persons
Capitalism: A social system based on the explicit recognition of private property and non aggressive contracts between private property owners
Socialism: The institutionalized aggression against private property and private property claims
Communism: The abolition of private property
Two ways to justly acquire private property- voluntary exchange/contract and original appropriation/homesteading.